/**
 * IOTLink 联物智联 — 工业物联网通讯设备官网
 * 设计系统：深灰基底(#1A1A1A) + 工业橙(#E8701A) + 银灰辅助
 * 风格：暗色主题、直角硬朗、数据可视化感
 * 字体：Rajdhani(标题) + Noto Sans SC(正文) + JetBrains Mono(数据)
 * 纯原生CSS，无框架依赖
 */


/* ============================================================
   CSS 变量体系 — 工业控制台配色
   ============================================================ */
:root {
  /* 基底色 */
  --bg-deep: #0D0D0D;
  --bg-primary: #1A1A1A;
  --bg-secondary: #141414;
  --bg-card: #1E1E1E;
  --bg-card-hover: #252525;
  --bg-input: #222222;

  /* 品牌色 */
  --orange: #E8701A;
  --orange-hover: #FF7F2A;
  --orange-dark: #C55A10;
  --orange-dim: rgba(232, 112, 26, 0.12);
  --orange-glow: rgba(232, 112, 26, 0.25);

  /* 辅助色 */
  --silver: #B0B0B0;
  --silver-dark: #707070;
  --steel: #3A3A3A;
  --steel-light: #4A4A4A;

  /* 文字色阶 */
  --text-primary: #E8E8E8;
  --text-secondary: #A0A0A0;
  --text-muted: #606060;
  --text-inverse: #0D0D0D;

  /* 边框 */
  --border-card: #2A2A2A;
  --border-orange: rgba(232, 112, 26, 0.35);
  --border-subtle: rgba(255, 255, 255, 0.06);

  /* 阴影 */
  --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.5);
  --shadow-card-hover: 0 4px 24px rgba(0, 0, 0, 0.6);
  --shadow-orange: 0 0 20px rgba(232, 112, 26, 0.15);

  /* 圆角 — 直角工业感 */
  --radius-none: 0;
  --radius-sm: 1px;
  --radius-md: 2px;
  --radius-lg: 3px;

  /* 间距 */
  --section-gap: 80px;
  --container-max: 1200px;

  /* 字体 */
  --font-body: 'Noto Sans SC', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Cascadia Code', 'Consolas', monospace;
  --font-heading: 'Rajdhani', 'Noto Sans SC', -apple-system, 'PingFang SC', sans-serif;

  /* 过渡 */
  --transition-fast: 0.15s ease;
  --transition-base: 0.25s ease;
  --transition-slow: 0.4s ease;
}

/* ============================================================
   基础重置
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { border: none; background: none; cursor: pointer; font: inherit; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
.container { max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
.section { padding: var(--section-gap) 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* ============================================================
   排版
   ============================================================ */
.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
  margin-bottom: 12px;
  position: relative;
  padding-left: 20px;
}
.section-tag::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 1px;
  background: var(--orange);
}
.section-title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.3;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.section-subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.6;
}

/* ============================================================
   按钮系统
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  border-radius: var(--radius-none);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}
.btn--primary {
  background: var(--orange);
  color: #fff;
  border: 1px solid var(--orange);
}
.btn--primary:hover {
  background: var(--orange-hover);
  border-color: var(--orange-hover);
  box-shadow: var(--shadow-orange);
  transform: translateY(-1px);
}
.btn--outline {
  background: transparent;
  color: var(--orange);
  border: 1px solid var(--orange);
}
.btn--outline:hover {
  background: var(--orange);
  color: #fff;
  box-shadow: var(--shadow-orange);
}
.btn--ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--steel);
}
.btn--ghost:hover {
  color: var(--orange);
  border-color: var(--orange);
}
.btn--dark {
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--steel);
}
.btn--dark:hover {
  border-color: var(--orange);
  color: var(--orange);
}

/* ============================================================
   Header — 深色实底固定
   ============================================================ */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: rgba(13, 13, 13, 0.95);
  border-bottom: 1px solid var(--border-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--transition-base), border-color var(--transition-base);
}
.header.scrolled {
  background: rgba(13, 13, 13, 0.98);
  border-bottom-color: var(--orange-dim);
}
.header__inner {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  height: 64px;
  gap: 32px;
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.header__logo-icon {
  width: 36px;
  height: 36px;
  background: var(--orange);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-none);
}
.header__logo-icon i {
  color: #fff;
  font-size: 1.1rem;
}
.header__logo-text { line-height: 1.2; }
.header__logo-name {
  display: block;
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.03em;
}
.header__logo-sub {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.6rem;
  color: var(--silver-dark);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* 主导航 */
.header__nav { display: flex; align-items: center; gap: 4px; flex: 1; }
.header__nav-link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: 0.03em;
  transition: color var(--transition-fast);
  position: relative;
  border-radius: var(--radius-none);
}
.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--orange);
  transform: scaleX(0);
  transition: transform var(--transition-base);
}
.header__nav-link:hover,
.header__nav-link.active {
  color: var(--text-primary);
}
.header__nav-link.active::after {
  transform: scaleX(1);
}

/* 导航下拉 */
.header__nav-item { position: relative; }
.header__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 180px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-top: 2px solid var(--orange);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all var(--transition-base);
  z-index: 60;
  padding: 8px 0;
}
.header__nav-item:hover .header__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}
.header__dropdown a {
  display: block;
  padding: 10px 18px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
  white-space: nowrap;
}
.header__dropdown a:hover {
  color: var(--orange);
  background: var(--orange-dim);
  padding-left: 22px;
}

/* Header 右侧操作 */
.header__actions { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.header__cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 20px;
  background: var(--orange);
  color: #fff;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  border-radius: var(--radius-none);
  transition: all var(--transition-base);
}
.header__cta:hover {
  background: var(--orange-hover);
  box-shadow: var(--shadow-orange);
}

/* 汉堡菜单 — 独立于 header__actions (13.4) */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 0;
  cursor: pointer;
  z-index: 1010;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition-base);
  transform-origin: center;
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ============================================================
   移动端侧滑菜单
   ============================================================ */
.mobile-nav {
  position: fixed;
  top: 0;
  right: -320px;
  width: 300px;
  height: 100vh;
  background: var(--bg-deep);
  z-index: 1005;
  transition: right var(--transition-slow);
  overflow-y: auto;
  border-left: 1px solid var(--border-card);
}
.mobile-nav.open { right: 0; }
.mobile-nav__inner { padding: 80px 24px 40px; }
.mobile-nav__link {
  display: block;
  padding: 14px 0;
  font-size: 1rem;
  color: var(--text-primary);
  border-bottom: 1px solid var(--border-card);
  transition: color var(--transition-fast);
}
.mobile-nav__link:hover { color: var(--orange); }
.mobile-nav__sub {
  display: none;
  padding: 4px 0 8px 16px;
}
.mobile-nav__sub.open { display: block; }
.mobile-nav__sub a {
  display: block;
  padding: 10px 0;
  font-size: 0.9rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.mobile-nav__sub a:hover { color: var(--orange); }
.mobile-nav__overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  z-index: 1004;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}
.mobile-nav__overlay.open { opacity: 1; visibility: visible; }

/* ============================================================
   Hero / Banner — 全屏轮播
   ============================================================ */
.hero {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  overflow: hidden;
  background: var(--bg-deep);
  /* 兜底：无幻灯片时的工业感背景 */
  background-image:
    linear-gradient(0deg, rgba(13,13,13,0.95) 0%, rgba(13,13,13,0.6) 50%, rgba(13,13,13,0.85) 100%),
    repeating-linear-gradient(0deg, transparent, transparent 2px, rgba(232,112,26,0.03) 2px, rgba(232,112,26,0.03) 4px),
    repeating-linear-gradient(90deg, transparent, transparent 2px, rgba(232,112,26,0.02) 2px, rgba(232,112,26,0.02) 4px);
}
.hero-swiper { width: 100%; height: 100%; }
.hero__slide {
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}
.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(13,13,13,0.65) 0%, rgba(13,13,13,0.4) 40%, rgba(13,13,13,0.8) 100%);
  z-index: 2;
}
.hero__content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  z-index: 3;
  width: 90%;
  max-width: 800px;
}
.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  color: #fff;
  line-height: 1.2;
  margin-bottom: 20px;
  letter-spacing: 0.04em;
}
.hero__title span { color: var(--orange); }
.hero__subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--silver);
  margin-bottom: 36px;
  line-height: 1.6;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero__actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-pagination {
  position: absolute !important;
  bottom: 100px !important;
  z-index: 3;
  display: flex;
  justify-content: center;
  gap: 10px;
}
.hero-pagination .swiper-pagination-bullet {
  width: 40px;
  height: 2px;
  border-radius: 0;
  background: rgba(255,255,255,0.4);
  opacity: 1;
}
.hero-pagination .swiper-pagination-bullet-active {
  background: var(--orange);
  width: 60px;
}

/* 滚动指示器 */
.hero__scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}
.hero__scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(180deg, var(--silver), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(1.2); }
}

/* ============================================================
   内页 Banner
   ============================================================ */
.inner-banner {
  position: relative;
  height: 320px;
  overflow: hidden;
  margin-top: 64px;
  background: var(--bg-deep);
}
.inner-banner__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  filter: brightness(0.35);
}
.inner-banner__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(13,13,13,0.9) 0%, rgba(13,13,13,0.3) 100%);
}
.inner-banner__content {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  text-align: center;
}
.inner-banner__title {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: 0.04em;
}
.inner-banner__subtitle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--silver);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-top: 8px;
}

/* 面包屑 */
.breadcrumb-bar { background: var(--bg-secondary); border-bottom: 1px solid var(--border-card); }
.breadcrumb {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 12px 20px;
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.breadcrumb a { color: var(--text-muted); transition: color var(--transition-fast); }
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb i, .breadcrumb .fa-solid { margin: 0 6px; font-size: 0.6rem; color: var(--text-muted); }

/* ============================================================
   卡片系统 — 深色+橙色边框
   ============================================================ */
.card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  border-radius: var(--radius-none);
  overflow: hidden;
  transition: all var(--transition-base);
}
.card:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow-orange);
  transform: translateY(-2px);
}
.card__image {
  position: relative;
  width: 100%;
  padding-top: 66%;
  overflow: hidden;
  background: var(--bg-secondary);
}
/* 空图片占位图标 */
.card__image::before {
  content: '\f085';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  font-size: 2.5rem;
  color: var(--steel);
  z-index: 0;
}
.card__image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
  z-index: 1;
  opacity: 0;
}
.card__image img.loaded {
  opacity: 1;
}
.card:hover .card__image img.loaded { transform: scale(1.04); }
.card__image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.card:hover .card__image img { transform: scale(1.04); }
.card__body { padding: 20px; }
.card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--orange);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
  padding: 2px 8px;
  border: 1px solid var(--orange-dim);
  background: var(--orange-dim);
}
.card__title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card__desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-card);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}
.card__meta i { color: var(--orange); margin-right: 4px; }

/* 产品卡片变体 */
.card--product .card__image { padding-top: 75%; }
.card--product .card__specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 16px;
  margin-top: 10px;
}
.card--product .card__spec {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
}
.card--product .card__spec strong {
  display: block;
  color: var(--silver);
  font-weight: 500;
  font-size: 0.78rem;
}

/* 案例卡片变体 */
.card--case .card__image { padding-top: 50%; }
.card--case .card__image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(0deg, rgba(13,13,13,0.7) 0%, transparent 50%);
  transition: opacity var(--transition-base);
}
.card--case:hover .card__image::after { opacity: 0.5; }
.card--case .card__overlay-text {
  position: absolute;
  bottom: 16px;
  left: 16px;
  right: 16px;
  z-index: 2;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: #fff;
}

/* 新闻卡片变体 */
.card--news { display: flex; flex-direction: row; }
.card--news .card__image { width: 200px; min-width: 200px; padding-top: 0; height: 140px; }
.card--news .card__body { flex: 1; display: flex; flex-direction: column; }
.card--news .card__date {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: auto;
}

/* ============================================================
   网格布局
   ============================================================ */
.list-grid { display: grid; gap: 24px; }
.list-grid--2 { grid-template-columns: repeat(2, 1fr); }
.list-grid--3 { grid-template-columns: repeat(3, 1fr); }
.list-grid--4 { grid-template-columns: repeat(4, 1fr); }

/* ============================================================
   数据指标区 (Stats)
   ============================================================ */
.stats-section { background: var(--bg-deep); border-top: 1px solid var(--border-card); border-bottom: 1px solid var(--border-card); }
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  text-align: center;
}
.stat-item {
  padding: 48px 20px;
  position: relative;
}
.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 20%;
  height: 60%;
  width: 1px;
  background: var(--border-card);
}
.stat-item__number {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}
.stat-item__number span { font-size: 1.2rem; }
.stat-item__label {
  font-size: 0.9rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
}

/* ============================================================
   合作伙伴 / 友链
   ============================================================ */
.partners-section { background: var(--bg-deep); }
.partners-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 40px;
  padding: 40px 0;
}
.partners-grid a {
  opacity: 0.45;
  transition: all var(--transition-base);
  filter: grayscale(100%) brightness(1.5);
}
.partners-grid a:hover { opacity: 1; filter: grayscale(0%) brightness(1); }
.partners-grid img { max-height: 48px; width: auto; }

/* ============================================================
   通讯架构图
   ============================================================ */
.architecture {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  padding: 40px 0;
}
.arch-node {
  flex: 0 0 220px;
  padding: 32px 20px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  text-align: center;
  position: relative;
  transition: all var(--transition-base);
}
.arch-node:hover {
  border-color: var(--orange);
  box-shadow: var(--shadow-orange);
}
.arch-node__icon {
  font-size: 2rem;
  color: var(--orange);
  margin-bottom: 12px;
}
.arch-node__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 6px;
}
.arch-node__desc {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.5;
}
.arch-arrow {
  flex: 0 0 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--orange);
  font-size: 1.5rem;
}
.arch-arrow::before {
  content: '';
  display: block;
  width: 100%;
  height: 2px;
  background: var(--orange);
  position: relative;
}
.arch-arrow i {
  position: absolute;
  color: var(--orange);
}

/* ============================================================
   CTA 区块
   ============================================================ */
.cta-section {
  background: var(--bg-deep);
  border-top: 1px solid var(--orange);
  border-bottom: 1px solid var(--orange);
  text-align: center;
  padding: 80px 0;
}
.cta-section__title {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.cta-section .btn { margin-top: 16px; }

/* ============================================================
   开发者卡片
   ============================================================ */
.dev-card {
  display: flex;
  align-items: flex-start;
  gap: 24px;
  padding: 32px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  transition: all var(--transition-base);
}
.dev-card:hover { border-color: var(--orange); }
.dev-card__icon {
  width: 56px;
  height: 56px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--orange-dim);
  color: var(--orange);
  font-size: 1.5rem;
}
.dev-card__info { flex: 1; }
.dev-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.dev-card__desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}

/* ============================================================
   内页布局 — 侧边栏+内容
   ============================================================ */
.page-layout { display: flex; gap: 32px; padding: 48px 0; }

/* 侧边栏 */
.sidebar {
  width: 260px;
  flex-shrink: 0;
}
.sidebar__title {
  padding: 20px;
  background: var(--bg-deep);
  border-left: 3px solid var(--orange);
  margin-bottom: 0;
}
.sidebar__title h3 {
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.sidebar__title p {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.sidebar__nav { border: 1px solid var(--border-card); border-top: none; }
.sidebar__nav a {
  display: flex;
  align-items: center;
  padding: 14px 20px;
  font-size: 0.9rem;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border-card);
  transition: all var(--transition-fast);
  position: relative;
}
.sidebar__nav a::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--steel);
  margin-right: 12px;
  flex-shrink: 0;
  transition: background var(--transition-fast);
}
.sidebar__nav a:hover,
.sidebar__nav a.active {
  color: var(--orange);
  background: var(--orange-dim);
}
.sidebar__nav a:hover::before,
.sidebar__nav a.active::before {
  background: var(--orange);
}

/* 主内容区 */
.page-main { flex: 1; min-width: 0; }

/* ============================================================
   产品详情页
   ============================================================ */
.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.product-gallery {
  position: sticky;
  top: 88px;
}
.product-gallery__main {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  overflow: hidden;
}
.product-gallery__main img { width: 100%; height: auto; }
.product-gallery__thumbs {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.product-gallery__thumb {
  width: 72px;
  height: 56px;
  border: 1px solid var(--border-card);
  cursor: pointer;
  overflow: hidden;
  opacity: 0.5;
  transition: all var(--transition-fast);
}
.product-gallery__thumb.active,
.product-gallery__thumb:hover {
  border-color: var(--orange);
  opacity: 1;
}
.product-gallery__thumb img { width: 100%; height: 100%; object-fit: cover; }

.product-info__title {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}
.product-info__specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 24px 0;
  padding: 24px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
}
.product-info__spec {
  font-size: 0.85rem;
  color: var(--text-secondary);
}
.product-info__spec strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--orange);
  font-weight: 600;
  margin-bottom: 2px;
}

/* 详情Tab */
.detail-tabs { display: flex; border-bottom: 2px solid var(--border-card); margin-top: 48px; }
.detail-tab {
  padding: 14px 28px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  cursor: pointer;
  transition: all var(--transition-fast);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  letter-spacing: 0.04em;
}
.detail-tab:hover { color: var(--text-secondary); }
.detail-tab.active {
  color: var(--orange);
  border-bottom-color: var(--orange);
}
.detail-tab-panel { display: none; padding: 32px 0; }
.detail-tab-panel.active { display: block; }

/* 详情正文 */
.detail__body { color: var(--text-secondary); line-height: 1.8; font-size: 0.95rem; }
.detail__body img { max-width: 100%; max-height: 500px; object-fit: cover; margin: 24px 0; }
.detail__body p { margin-bottom: 16px; }
.detail__body h3 { font-size: 1.3rem; color: var(--text-primary); margin: 32px 0 12px; }
.detail__body table { width: 100%; border-collapse: collapse; margin: 20px 0; }
.detail__body table td, .detail__body table th {
  padding: 10px 16px;
  border: 1px solid var(--border-card);
  font-size: 0.9rem;
}
.detail__body table th {
  background: var(--bg-card);
  color: var(--orange);
  font-weight: 600;
  text-align: left;
}

/* 上一篇/下一篇 */
.prev-next { display: flex; justify-content: space-between; gap: 16px; margin-top: 48px; padding-top: 24px; border-top: 1px solid var(--border-card); font-size: 0.9rem; }
.prev-next a { color: var(--text-secondary); transition: color var(--transition-fast); }
.prev-next a:hover { color: var(--orange); }

/* ============================================================
   分页
   ============================================================ */
.pagination {
  display: flex;
  justify-content: center;
  gap: 4px;
  margin-top: 48px;
  flex-wrap: wrap;
}
.pagination a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 12px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}
.pagination a:hover,
.pagination a.active {
  border-color: var(--orange);
  color: var(--orange);
  background: var(--orange-dim);
}
.no-data { text-align: center; padding: 60px 20px; color: var(--text-muted); font-size: 0.95rem; }

/* ============================================================
   联系页
   ============================================================ */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-card);
}
.contact-info__item i {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--orange-dim);
  color: var(--orange);
  font-size: 1.1rem;
  flex-shrink: 0;
}
.contact-info__item h4 {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 4px;
  font-weight: 600;
}
.contact-info__item p { font-size: 0.85rem; color: var(--text-muted); }

/* 表单 */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}
.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 12px 16px;
  background: var(--bg-input);
  border: 1px solid var(--border-card);
  color: var(--text-primary);
  font-size: 0.9rem;
  border-radius: var(--radius-none);
  transition: border-color var(--transition-fast);
  outline: none;
}
.form-input:focus, .form-textarea:focus, .form-select:focus {
  border-color: var(--orange);
}
.form-textarea { min-height: 140px; resize: vertical; }
.form-select { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23707070' fill='none' stroke-width='1.5'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 16px center; }

/* ============================================================
   搜索页
   ============================================================ */
.search-form-box { max-width: 600px; margin: 0 auto 48px; }
.search-form-box form { display: flex; gap: 8px; }
.search-form-box input { flex: 1; }
.search-result-count {
  text-align: center;
  margin-bottom: 32px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-muted);
}
.search-result-count strong { color: var(--orange); }

/* ============================================================
   Footer — 四列暗色布局
   ============================================================ */
.footer { background: var(--bg-deep); border-top: 2px solid var(--orange); }
.footer__grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.2fr 1fr;
  gap: 40px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 60px 20px 40px;
}
.footer__col-title {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 20px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-card);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.footer__brand-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 16px;
}
.footer__social { display: flex; gap: 10px; }
.footer__social a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--steel);
  color: var(--silver-dark);
  transition: all var(--transition-fast);
}
.footer__social a:hover { border-color: var(--orange); color: var(--orange); }
.footer__links a {
  display: block;
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  transition: all var(--transition-fast);
}
.footer__links a:hover { color: var(--orange); padding-left: 4px; }
.footer__contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 6px 0;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.footer__contact-item i { color: var(--orange); margin-top: 3px; font-size: 0.8rem; }
.footer__qrcode {
  width: 100px;
  height: 100px;
  background: var(--bg-card);
  border: 1px solid var(--border-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.5;
}
.footer__bottom {
  border-top: 1px solid var(--border-card);
  padding: 20px;
}
.footer__bottom-inner {
  max-width: var(--container-max);
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer__bottom-inner a { color: var(--text-muted); transition: color var(--transition-fast); }
.footer__bottom-inner a:hover { color: var(--orange); }

/* 合作伙伴（footer中） */
.footer__partners {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px 20px;
}
.friend-links { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 20px; font-size: 0.8rem; }
.friend-links__label { color: var(--text-muted); flex-shrink: 0; font-weight: 600; }
.friend-links a { color: var(--text-muted); transition: color var(--transition-fast); }
.friend-links a:hover { color: var(--orange); }

/* ============================================================
   返回顶部
   ============================================================ */
.back-top {
  position: fixed;
  bottom: 32px;
  right: 32px;
  width: 44px;
  height: 44px;
  background: var(--orange);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all var(--transition-base);
  cursor: pointer;
  border-radius: var(--radius-none);
}
.back-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-top:hover { background: var(--orange-hover); }

/* ============================================================
   懒加载占位
   ============================================================ */
img[data-src] { opacity: 0; transition: opacity 0.4s ease; background: var(--bg-secondary); }
img[data-src].loaded { opacity: 1; }

/* ============================================================
   响应式 — 768px 断点
   ============================================================ */
@media (max-width: 1024px) {
  .header__nav { display: none; }
  .header__actions .header__cta { display: none; }
  .hamburger { display: flex; }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat-item:nth-child(2)::after { display: none; }
  .list-grid--4 { grid-template-columns: repeat(2, 1fr); }
  .list-grid--3 { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
  .product-detail { grid-template-columns: 1fr; }
  .page-layout { flex-direction: column; }
  .sidebar { width: 100%; }
  .contact-grid { grid-template-columns: 1fr; }
  .card--news { flex-direction: column; }
  .card--news .card__image { width: 100%; height: 180px; }
  .architecture { flex-direction: column; gap: 0; }
  .arch-arrow { transform: rotate(90deg); padding: 12px 0; }
}

@media (max-width: 768px) {
  :root { --section-gap: 56px; }
  .section-title { font-size: 1.5rem; }
  .hero__title { font-size: 1.8rem; }
  .stats { grid-template-columns: 1fr 1fr; }
  .stat-item { padding: 32px 16px; }
  .stat-item__number { font-size: 2.2rem; }
  .list-grid--2,
  .list-grid--3,
  .list-grid--4 { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr; gap: 28px; }
  .footer__bottom-inner { flex-direction: column; text-align: center; }
  .inner-banner { height: 220px; margin-top: 56px; }
  .inner-banner__title { font-size: 1.5rem; }
  .page-layout { padding: 32px 0; }
  .hero-pagination { bottom: 70px !important; }
  .pagination a { min-width: 36px; height: 36px; font-size: 0.8rem; }
  .detail-tabs { overflow-x: auto; white-space: nowrap; }
  .detail-tab { padding: 12px 18px; font-size: 0.82rem; }
  .product-info__specs { grid-template-columns: 1fr; }
}

/* June 22 mobile layout: compact industrial catalogue. */
@media(max-width:1024px){
 .container {padding-left:20px;padding-right:20px;min-width:0}
 .page-main,.card,.card__body,.detail,.contact-grid>*,.footer__grid>*,.header__logo {min-width:0}
 [data-aos="fade-left"],[data-aos="fade-right"]{transform:none!important}
 .header{z-index:1400}
 .header__inner {height:64px;gap:12px;padding:0 20px}
 .header__logo {flex:1}.header__logo-name {overflow-wrap:anywhere}
 .hamburger {flex-shrink:0;position:relative;z-index:1300}
 .page-inner .inner-banner {margin-top:80px;height:auto!important;min-height:170px}
 .inner-banner__content {padding:28px 20px;min-height:170px;height:auto;overflow-wrap:anywhere}
 .inner-banner__title {font-size:24px;line-height:1.35}
 .inner-banner__subtitle {font-size:13px;line-height:1.6;margin-top:8px;max-width:100%}
 .breadcrumb {padding:12px 20px;overflow-wrap:anywhere;flex-wrap:wrap;line-height:1.7}
 .detail__body {overflow-wrap:anywhere;min-width:0}.detail__body *{max-width:100%;box-sizing:border-box}
 .detail__body img {height:auto}.detail__body table {display:block;overflow-x:auto;max-width:100%}
 .detail__body pre {overflow-x:auto;white-space:pre;max-width:100%}
 .footer__grid {grid-template-columns:repeat(2,minmax(0,1fr));gap:22px 18px;padding:32px 20px 24px}
 .footer__grid>div:first-child {grid-column:1/-1}.footer__contact-item {overflow-wrap:anywhere}
 .footer__brand-desc {font-size:13px;line-height:1.6;margin-bottom:12px}
 .footer__col-title {margin-bottom:10px;padding-bottom:8px}.footer__links a {padding:7px 0}
 .footer__bottom {padding:16px 20px}.footer__bottom-inner {line-height:1.7;overflow-wrap:anywhere}
 .mobile-nav {width:min(86vw,340px);height:100dvh;max-width:340px;overscroll-behavior:contain}
 .mobile-nav__inner {padding:82px 20px 28px}.mobile-nav__link {padding:13px 10px;line-height:1.5}
 .mobile-nav__sub {padding:4px 12px 10px}.mobile-nav__sub a {padding:10px 8px}
 .mobile-nav__sub:not(.open) {display:none}
 .form-input,.form-select,.form-textarea,.form-control {font-size:16px;min-width:0;max-width:100%}
 form [style*="grid-template-columns"] {grid-template-columns:minmax(0,1fr)!important;gap:0!important}
 input[name="checkcode"]{min-width:0;flex:1;width:100px!important}
 .contact-info__item,.contact-info__value {overflow-wrap:anywhere;min-width:0}
 .pagination {margin-top:24px;gap:5px}.prev-next,.detail__pager {overflow-wrap:anywhere;gap:12px}
 [data-aos] {max-width:100%}

 .mobile-nav{right:-100%}.mobile-nav.open{right:0}
 .page-layout{padding:0;gap:24px}.page-main{width:100%}.sidebar{width:100%;max-width:100%}
 .sidebar__title{padding:16px}.sidebar__nav{display:flex;flex-wrap:wrap;gap:6px;padding:12px}
 .sidebar__nav a{width:auto;flex:0 1 auto;padding:10px 12px;border:1px solid var(--border-card)}
 .product-gallery {position:static;min-width:0}.product-gallery__thumbs{overflow-x:auto}.product-gallery__thumb{flex-shrink:0}
 .detail-tabs{max-width:100%;overflow-x:auto}.detail-tab{flex-shrink:0}
 .product-info__specs{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;padding:16px;overflow-wrap:anywhere}
 .architecture{padding:10px 0;display:grid;grid-template-columns:1fr;gap:8px;max-width:100%}
 .arch-node{display:grid;grid-template-columns:44px 1fr;gap:4px 14px;text-align:left;padding:18px;min-width:0}
 .arch-node__icon{grid-row:1/3;margin:0;align-self:center}.arch-node__desc br{display:block}.arch-node__desc{line-height:1.7}
 .arch-arrow{padding:0;width:22px;height:22px;justify-self:center;line-height:22px}.arch-arrow::before{display:none}
}
@media(max-width:767px){
 :root{--section-gap:36px}
 .section{padding-top:36px!important;padding-bottom:36px!important}
 .section-title{font-size:23px;line-height:1.4}.section-subtitle{font-size:14px;line-height:1.65}.section-tag{font-size:10px;margin-bottom:8px}
 .section>.container>[style*="margin-bottom"]{margin-bottom:24px!important}
 .section>.container>[style*="margin-top"]{margin-top:22px!important}
 .hero{height:470px;min-height:470px}.hero__content{top:54%;width:calc(100% - 40px);text-align:left}
 .hero__title{font-size:28px;line-height:1.4;margin-bottom:14px}.hero__subtitle{font-size:14px;line-height:1.7;margin-bottom:24px}
 .hero__actions{justify-content:flex-start;gap:10px}.btn{padding:11px 16px;font-size:13px;white-space:normal}
 .hero-pagination{position:static!important;transform:none;margin-top:22px;text-align:left}.hero__scroll-indicator{display:none}
 .stats-section>.container>[style]{padding-top:26px!important}.stats{grid-template-columns:repeat(2,minmax(0,1fr))}
 .stat-item{padding:18px 10px}.stat-item__number{font-size:26px}.stat-item__label{font-size:12px}
 .list-grid--2,.list-grid--3,.list-grid--4{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
 .card__image{padding-top:68%}.card__body{padding:12px}.card__title{font-size:14px;line-height:1.5}.card__desc{font-size:12px;line-height:1.6}
 .card__tag{font-size:10px;white-space:normal;overflow-wrap:anywhere}.card__meta{font-size:10px;gap:6px;flex-wrap:wrap;margin-top:10px}
 .card__specs{gap:8px;padding-top:10px;margin-top:10px;grid-template-columns:repeat(2,minmax(0,1fr))}
 .card__spec{font-size:10px;overflow-wrap:anywhere}.card__spec strong{font-size:11px}
 .list-grid:has(>.card--news),.list-grid:has(>.dev-card){grid-template-columns:1fr}
 .card--news{flex-direction:row;align-items:center}.card--news .card__image{width:92px;min-width:92px;height:100px;padding:0}
 .card--news .card__body{padding:12px}.card--news .card__desc{-webkit-line-clamp:2}
 .dev-card{padding:18px;gap:14px}.dev-card__icon{width:40px;height:40px;flex-shrink:0;font-size:20px}.dev-card__title{font-size:16px}
 .partners-grid{gap:18px;grid-template-columns:repeat(3,minmax(0,1fr))}.partners-grid img{max-width:100%;max-height:35px}
 .cta-section{padding:36px 0}.cta-section__title{font-size:23px;line-height:1.5}.cta-section p{font-size:14px}
 .product-detail{gap:24px}.product-info__title{font-size:23px}.detail-tab-panel{padding:22px 0}.detail-tabs{margin-top:26px}
 .search-form-box{margin-bottom:24px}.search-form-box input{width:0;min-width:0}.search-form-box button{padding:0 16px!important}
 .prev-next{flex-direction:column}.back-top{right:12px;bottom:20px;width:38px;height:38px}
}

/* Partner names remain readable even before a logo is uploaded in CMS. */
.partners-grid a {display:flex;flex-direction:column;align-items:center;gap:10px;max-width:100%;color:var(--text-primary);opacity:1;filter:none;text-align:center}
.partners-grid a:hover {color:var(--orange);filter:none}
.partners-grid .partner-name {font-size:16px;font-weight:600;line-height:1.5;overflow-wrap:anywhere}
.partners-grid img[data-src=""] {display:none}
.partners-grid a:focus-visible {outline:2px solid var(--orange);outline-offset:6px}